Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Sui, Chao; Xing, Lehong; Cai, Xue Xian; Wang, Yang; Zhou, Qibing; Li, Minghao

doi:10.3390/catal10020243

Cited by 18 publications

(6 citation statements)

References 54 publications

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“…As can be seen, MgO-36 showed the highest surface area (34.6 m 2 /g) with the smallest crystallite size (29.9 nm) among other MgO catalysts, while MgO-48 showed the smallest surface area (13.5 m 2 /g) with the biggest crystallite size (48.4 nm). The result obtained was also in agreement with the study carried out by Sui et al [34] that showed CeO 2 support, and the Co/CeO 2 catalyst exhibited a smaller particle size correlated with a higher specific surface area. For 30Ce/MgO catalysts, 30Ce/MgO-48 also showed the highest surface area (29.3 m 2 /g) compared to other 30Ce/MgO catalysts.…”

Section: Catalyst Characterizationsupporting

confidence: 92%

Synthesis of Ce/MgO Catalysts for Direct Oxidation of Hibiscus cannabinus Stalks to Vanillin

2021

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One possible method of producing vanillin from biomass is through controlled oxidation of lignin. Direct oxidation of kenaf stalks was chosen without having to separate the cellulose and hemicellulose components from the lignocellulosic biomass. This makes the process greener, as well as saving time. In this paper, Ce/MgO catalysts were developed for oxidation of kenaf stalks and kenaf lignin under microwave irradiation. The catalysts were characterized for their physicochemical properties using XRD and N2 adsorption–desorption isotherms. The synthesized MgO showed the presence of diffraction peaks assigned to cubic MgO while the 30Ce/MgO catalysts showed the presence of cubic fluorite of CeO2. N2 adsorption–desorption isotherms showed that all catalysts possess Type III isotherm according to IUPAC classification, indicating a nonporous structure. All catalysts were tested for direct oxidation of kenaf stalks under 300 W of microwave irradiation using H2O2 as the oxidizing agent at pH 11.5 and temperatures between 160 and 180 °C for 10–30 min with 5–15% catalyst loading. The highest vanillin yields of 3.70% and 2.90% for extracted lignin and direct biomass oxidation were achieved using 30Ce/MgO-48. In comparison, 7.80% and 4.45% were obtained using 2N of NaOH homogeneous catalyst for extracted lignin and direct biomass, respectively, at 170 °C for 20 min. The reusability test shows that 30Ce/MgO can be used up to three cycles without significant loss in catalytic activity. Other compounds detected were 4-vinylguaiacol, syringol and syringaldehyde.

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Section: Catalyst Characterizationsupporting

confidence: 92%

Synthesis of Ce/MgO Catalysts for Direct Oxidation of Hibiscus cannabinus Stalks to Vanillin

2021

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“…56 For the bulk CeO 2 sample, the two main reduction peaks are concentrated at 536 and 857 °C, respectively. 57 The first peak is attributed to consumption of hydrogen by non-stoichiometric superficial Ce 4+ , and the other peak is related to the reduction of Ce 4+ to Ce 3+ in the bulk phase. 58,59 Compared with the bulk CeO 2 and Mn 2 O 3 , the CeO 2 –MnO x composite oxide samples exhibit two reduction peaks at ∼280 and 380 °C, which are attributed to the reduction of MnO x species in the CeO 2 –MnO x composite oxides.…”

Section: Resultsmentioning

confidence: 99%

Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO₂–MnO_x composite oxides

et al. 2022

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“…In case of heterogeneous catalyst, the extent of adsorption of reactants on the surface of catalyst decides the activity of catalyst [71] . The amount of catalyst into the reaction medium defines the active sites and hence controls the productivity and selectivity of the desired product [72] . However, the influence of CuO/CeO 2 /ZnO catalyst loading on glycerol conversion, GC yield and selectivity was studied.…”

Section: Resultsmentioning

confidence: 99%

“…[71] The amount of catalyst into the reaction medium defines the active sites and hence controls the productivity and selectivity of the desired product. [72] However, the influence of CuO/CeO 2 /ZnO catalyst loading on glycerol conversion, GC yield and selectivity was studied. The influence of CuO/CeO 2 /ZnO catalyst concentration on Glycerol conversion, GC yield and selectivity is shown (Figure 7).…”

Section: Influence Of 5 Wt % Cuo/ceo 2 /Zno Catalyst Concentrationmentioning

confidence: 99%

Mingled Metal Oxides Catalyst for Direct Carbonylation of Glycerol into Glycerol Carbonate

Pandey

Pawar

2022

ChemistrySelect

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The escalation of CO 2 into the atmosphere has encouraged the development of sustainable pathways to produce materials and chemicals from CO 2 . In the present manuscript, an attempt has been made for direct carbonylation of glycerol into Glycerol carbonate (GC) by using CO 2 over mingled metal oxide (MMO) catalyst. Several single, bi and trimetal oxides catalysts were explored for direct carbonylation of glycerol. Among the tested catalysts, Cu incorporated MMO showed the profound effect to obtain maximum glycerol conversion and GC selectively. However, a series of MMO catalysts with variable Cu loading were synthesized by simple co-precipitation method and tested for direct carbonylation of glycerol. Of all tested Cu loaded MMO catalyst, 5 % Cu loaded MMO catalyst (CuO/CeO 2 /ZnO) showed highest GC selectivity (99 %). Furthermore, the process intensification study was conducted to investigate the influence of various reaction parameters on glycerol conversion and GC yield such as catalyst loading, temperature, CO 2 pressure, time, and solvent concentration. The intensified process resulted into 57.4 % glycerol conversion with 57.2 % GC yield and 99.65 % selectivity. Moreover, the in-depth physicochemical characterisations of the synthesised MMO catalyst were conducted by using various surface analytical techniques. The synthesised MMO has showed a synergistic and protagonistic effect for direct carbonylation of glycerol. The recyclability study was performed to examine the robustness and efficency of the MMO catalyst that showed the consistency in the GC yield, conversion and selectivity without any significant loss after six consecutive runs. Also, the plausible reaction mechanism over MMO catalyst was proposed. The reported methodology has explored a simple, robust and efficient process for direct carbonylation of glycerol by using MMO catalyst with higher yield and selectivity of GC.

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Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Cited by 18 publications

References 54 publications

Synthesis of Ce/MgO Catalysts for Direct Oxidation of Hibiscus cannabinus Stalks to Vanillin

Synthesis of Ce/MgO Catalysts for Direct Oxidation of Hibiscus cannabinus Stalks to Vanillin

Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO₂–MnO_x composite oxides

Mingled Metal Oxides Catalyst for Direct Carbonylation of Glycerol into Glycerol Carbonate

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Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

Cited by 18 publications

References 54 publications

Synthesis of Ce/MgO Catalysts for Direct Oxidation of Hibiscus cannabinus Stalks to Vanillin

Synthesis of Ce/MgO Catalysts for Direct Oxidation of Hibiscus cannabinus Stalks to Vanillin

Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO2–MnOx composite oxides

Mingled Metal Oxides Catalyst for Direct Carbonylation of Glycerol into Glycerol Carbonate

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Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO₂–MnO_x composite oxides